Scooter

ABSTRACT

The scooter of the present invention includes a footboard having a front portion, and a rear portion attached to a rear wheel; a front wheel axle having an upward axis perpendicular with the front wheel axle and a steering axis, wherein the front wheel axle is rotatable with respect to the steering axis; and a plurality of front wheels attached to the front wheel axle. The steering axis forms a predetermined adjacent angle between 0 degree and 90 degree with respect to the upward axis.

FIELD OF THE INVENTION

The present invention relates to a scooter, in particular, a scooter without a handle for steering.

BACKGROUND

There are numerous scooters in the market which require a steering handle to turn the scooter. The user has to use his hands to steer the handle in order to turn the wheels of the scooter. It will be more convenient and entertaining if the user can turn the scooter without using his hands to physically turn the steering handle, but simply by banking the scooter to one side.

It is an objective of the present invention to provide an improved scooter without a steering handle for turning the scooter.

SUMMARY

An object of the present invention is to provide a scooter which can be steered by the user simply by banking the scooter to one side.

The scooter of the present invention includes a footboard having a front portion, and a rear portion attached to a rear wheel; a front wheel axle having an upward axis perpendicular with the front wheel axle and a steering axis, wherein the front wheel axle is rotatable with respect to the steering axis; and a plurality of front wheels attached to the front wheel axle. The steering axis forms a predetermined adjacent angle between 0 degree and 90 degree with respect to the upward axis. As a result of the predetermined adjacent angle, the front wheel axle and the front wheels are steered simply by applying force on the footboard to a side.

In another embodiment, the scooter further includes a steering member disposed at the front portion along the steering axis and operatively attached to the front wheel axle. The steering member is configured to steer the front wheel axle when force is applied on the steering member.

Preferably, the scooter of an embodiment further includes a biasing device operable between a released condition and a distorted condition, and disposed at the front portion along the steering axis and operatively attached to the front wheel axle. The biasing device is turned from the released condition to the distorted condition when force is applied to steer the front wheel axle, and returns to the released condition when the force applied to steer the front wheel axle is released.

An advantage of the present invention is that the user can steer the front wheels of the scooter without using his hands. The scooter can be steered by the user simply by shifting his weight (center of gravity) applying on the scooter.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of the present invention will become more apparent upon consideration of the following detailed description of preferred embodiments, taken in conjunction with the accompanying figures, wherein:

FIG. 1 is a perspective view of an embodiment of this invention.

FIG. 2 is an exploded view of the foldable scooter in FIG. 1.

FIG. 3 is an illustrative side view of a front wheel axle and a steering member of the scooter in FIG. 1.

FIG. 4 is an illustrative plan view of a front wheel axle, a steering member and the front wheels of the scooter taken along the plane of A-A of FIG. 3.

FIG. 5 is a perspective view of a front wheel axle, a steering member and a biasing device of the foldable scooter in FIG. 1.

FIG. 6 is a bottom perspective view of a first portion of the steering member of FIG. 5.

DETAILED DESCRIPTION

As shown in FIGS. 1 and 2, a preferred embodiment of the present invention is a scooter 5 including a footboard 30, a holding column 40, two front wheels 10 and a rear wheel 11. The front wheels and the rear wheel are attached to a front portion 32 and a rear portion 34 of the footboard respectively. The number of the front and rear wheels in this embodiment is just for example.

The front wheels 10 are attached to a front wheel axle 50. The front wheel axle 50 has a pivot 51 and a steering axis 56 while the front wheel axle 50 and the front wheels 10 are steered with respect to the pivot 51 and the steering axis 56. The steering axis 56 is inclined toward a front direction of the scooter 5, such that it forms a predetermined adjacent angle 53 with an upward axis 55 perpendicular with the front wheel axle 50. The adjacent angle 53 is larger than 0 degrees and smaller than 90 degrees. Preferably, the adjacent angle is 20 degrees, but the adjacent angle may be bigger or smaller than the example given herein.

A steering member 60 is disposed along the steering axis 56 on the front wheel axle 50 at one end for steering the front wheel axle to the same side when force is applied on the steering member on one side. The steering member is attached to the bottom of the front portion 32 of the footboard 30 at the other end. In this embodiment, the steering member 60 includes a first portion 62 attached to the base of the front portion 32 of the footboard 30, and a second portion 64 attached on the front wheel axle 50.

As an example, in this embodiment, the second portion 64 is attached at the pivot 51 of the front wheel axle 50 as an extension from the front wheel axle, but the second portion may be attached to the front wheel axle by other means or at other position. The steering member 60 has to be attached to the front wheel axle such that when force is applied on the steering member, such force may be transferred to steer the front wheel axle.

When the scooter 5 is in a straight position, the user's weight distributes equally on both front wheels 10 and the balance of force prevents the front wheel axle 50 from rotating about the pivot 51 and the steering axis 56. The scooter will go in a straight course.

For instance, when the user banks the scooter to the left side or shifts a portion of his weight to the left side, such force will pass from the footboard 30 and the holding column 40 on the steering member 60, and through the front wheel axle 50 on to the left front wheel 10. The left front wheel will be subject to an upward reaction force F which acts in a direction opposite to the force from the steering member as shown in FIG. 3.

The steering member 60 is purportedly mounted in a way such that the steering axis 56 of the front wheel axle 50 is inclined at the predetermined adjacent angle 53 with respect to the upward axis 55. Due to the inclination of the steering axis 56, the components of the force F acting on the left front wheel 10 can be quantified as Fx and Fz as shown in FIG. 3. The force Fx causes rotational movement of the front wheel axle 50 at the pivot 51 with respect to the steering axis 56.

FIG. 4 shows a view of the front wheel axle 50 and the front wheels 10 on a plane normal to the steering axis 56. The force Fx acts on the front wheel 10 with a perpendicular distance ‘d,’ from the steering axis and generates a moment about the steering axis, causing the front wheel axle to rotate about the steering axis and steer the front wheels accordingly.

The force Fx is resulted from the user's force and is substantially less than the force F generated by the user's initial effort of banking the scooter due to the adjacent angle 53 between the steering member (the steering axis 56) and the upward axis 55. The adjacent angle is predetermined so that the generated Fx of the reaction force is sufficient to overcome the friction from the wheels and bearings and to initiate the rotation and steering of the front wheel axle 50.

When the user shifts his weight or center of gravity to one side, the force will be applied from the footboard 30 on to the steering member 60, causing the front wheel axle 50 to steer to the same side. As a result of the rotation of the front wheel axle 50 with respect to the inclined steering axis 56, the footboard 30 will be allowed to bank downward toward the turning side.

As shown in FIGS. 5 and 6, in this embodiment, each of the first portion 62 and the second portion 64 of the steering member 60 has a cavity for receiving a biasing device 70. The biasing device is operable between a released condition and a distorted condition. The biasing device is turned from the released condition to the distorted condition when force is applied on the steering member to steer the front wheel axle 50, and returns to the released condition when the force applied on the steering member to steer the front wheel axle is released.

The biasing device 70, by a non-limiting example, may be an elastic member in a hexagonal cylindrical shape and made of silicon rubber. The biasing device 70, in this embodiment, has a circumferential surface 72 corresponding to a first inner surface 63 of the first portion 62 and a second inner surface 65 of the second portion 64. The corresponding circumferential surface and the internal surface cause the biasing device to be twisted with the second portion when the front wheel axle 50 is steered. The biasing device may be attached to the steering member 60 by other means.

When force is applied by the user on the steering member 60 to steer the front wheel axle 50, the biasing device 70 is twisted from the released condition to the distorted condition. When the user releases his force on the steering member 60 to steer the front wheel axle 50, the biasing device returns to the released condition, such that the front wheel axle is steered back and the front wheels 10 are returned to the straight position for the scooter 5 to go in a straight course. Without the assistance of the biasing device, the user has to solely use his own force to apply on the steering member to steer the front wheel axle and the front wheels back to the straight position.

The biasing device 70 may be in other form, for example a torsion spring, or attached to the steering member 60 by other means.

By a non-limiting example, a pair of protrusions 66 is formed on the outer surface 68 of the second portion 62 and stoppers 67 are formed on the first inner surface 63 of the first portion 62 to restrict the steering of the front wheel axle 10 to a certain degree.

The holding column 40 is for the user to hold as a handle for better balance and is not for steering the scooter. The scooter may therefore be operated with or without the holding column. Preferably the holding column 40 is tilted slightly backward to keep the center of gravity of the user and the scooter 5 near the center position of the scooter.

An elastic member 80 is disposed on each side of the front wheel axle 50 operatively attached to the front wheels 10 to absorb shock. The elastic member may be replaced by other biasing device to act as the shock absorber.

The embodiments described in this specification and the contents disclosed therein are provided by way of illustration only. The invention can be applied equally well on other types of scooter.

While the invention has been described in detail with reference to disclosed embodiments, various modifications within the scope of the invention will be apparent to those of ordinary skill in this technological field. It is to be appreciated that features described with respect to one embodiment typically may be applied to other embodiments. 

What is claimed is:
 1. A scooter, comprising: a footboard having a front portion, and a rear portion attached to a rear wheel; a front wheel axle having an upward axis perpendicular with the front wheel axle and a steering axis, wherein the front wheel axle is rotatable with respect to the steering axis; a plurality of front wheels attached to the front wheel axle; a steering member positioned at the front portion of the footboard along the steering axis and operatively attached to the front wheel axle for steering the front wheel axle when force is applied on the steering member, the steering member comprising: a first portion attached to the front portion; a second portion attached to the front wheel axle and engaged with the first portion; a biasing device positioned between the first portion and the second portion, the biasing device being operable between a released condition and a distorted condition; protrusions formed on an outer circumferential surface of the second portion; and stoppers corresponding to the protrusions formed as recesses on an inner circumferential surface of the first portion, the stoppers configured to engage with the protrusions to restrict the steering of the front wheel axle to a certain degree during movement of the front wheel axle; wherein the steering axis is inclined toward a front direction of the footboard of the scooter and forms a predetermined adjacent angle larger than degrees and smaller than 90 degrees with respect to the upward axis.
 2. The scooter as recited in claim 1, wherein the biasing device is turned from the released condition to the distorted condition when force is applied on the steering member to steer the front wheel axle, and returns to the released condition when the force applied on the steering member to steer the front wheel axle is released.
 3. The scooter as recited in claim 1, wherein the biasing device is disposed at the front portion along the steering axis and operatively attached to the front wheel axle, and wherein, the biasing device is turned from the released condition to the distorted condition when force is applied to steer the front wheel axle, and returns to the released condition when the force applied to steer the front wheel axle is released.
 4. The scooter as recited in claim 1, wherein the biasing device is an elastic member in a hexagonal cylindrical shape and made of silicon rubber, and the biasing device is twisted in shape along with the steering of the front wheel axle.
 5. The scooter as recited in claim 1, wherein when user on the scooter applies force towards a side, the front wheel axle is steered to the same side.
 6. The scooter as recited in claim 1, wherein the biasing device comprises a circumferential surface, the first portion comprises an inner surface corresponding to the circumferential surface of the biasing device.
 7. The scooter as recited in claim 1, wherein the biasing device comprises a circumferential surface, the second portion comprises an inner surface corresponding to the circumferential surface of the biasing device, the circumferential surface and the internal surface cause the biasing device to be twisted with the second portion when the front wheel axle is steered.
 8. The scooter as recited in claim 1, further comprising a holding column attached to the front portion.
 9. The scooter as recited in claim 8, wherein the holding column is inclined toward a back direction of the scooter.
 10. The scooter as recited in claim 1, wherein the front wheel axle has a pivot disposed along the steering axis, the second portion is attached at the pivot of the front wheel axle.
 11. The scooter as recited in claim 10, wherein each of the first portion and the second portion of the steering member has a cavity for receiving a biasing device.
 12. The scooter as recited in claim 1, wherein further comprising an elastic member disposed on each side of the front wheel axle operatively attached to the front wheels to absorb shock.
 13. The scooter as recited in claim 1, wherein the biasing device has a circumferential surface corresponding to a first inner surface of the first portion and a second inner surface of the second portion, the corresponding circumferential surface and the internal surface cause the biasing device to be twisted with the second portion when the front wheel axle is steered. 